#include "sys.h"
#include "usart.h"

#if SYSTEM_SUPPORT_OS
#include "includes.h"
#endif

#if 1
#pragma import(__use_no_semihosting)

struct __FILE
{
	int handle;
};

FILE __stdout;

void _sys_exit(int x)
{
	x = x;
}

//__use_no_semihosting was requested, but _ttywrch was 
void _ttywrch(int ch)
{
    ch = ch;
}


int fputc(int ch, FILE *f)
{
	while((USART1->SR&0X40)==0);
	USART1->DR = (u8) ch;
	return ch;
}
#endif

#if 1
//#if EN_USART1_RX
u8 USART_RX_BUF[USART_REC_LEN];

u16 USART_RX_STA=0; 

void uart_init(u32 bound)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

	GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOA,&GPIO_InitStructure);

	USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	USART_Init(USART1, &USART_InitStructure);

	USART_Cmd(USART1, ENABLE);

	//USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART1_RX	
	USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
	NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
#endif
}

void USART1_IRQHandler(void)
{
	u8 Res;
#if SYSTEM_SUPPORT_OS
	OSIntEnter();
#endif
	if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
	{
		Res =USART_ReceiveData(USART1);

		if((USART_RX_STA&0x8000)==0)
		{
			if(USART_RX_STA&0x4000)
			{
				if(Res!=0x0a)USART_RX_STA=0;
				else USART_RX_STA|=0x8000;
			}
			else
			{
				if(Res==0x0d)USART_RX_STA|=0x4000;
				else
				{
					USART_RX_BUF[USART_RX_STA&0X3FFF]=Res;
					USART_RX_STA++;
					if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
				}		 
			}
		}
  } 
#if SYSTEM_SUPPORT_OS
	OSIntExit();
#endif
} 
#endif	

